I would love to find a clear explanation. Is the power coming into my house single phase(2 110 lines in phase with each other)? split phase (2 110 line 180 out of phase)? If B, why is it refered to as single phase? I believe it is B or the two legs of 220 would read 0 volts? If someone could get back to me I would appreciate it! If there is a good online resource please let me know. This website calls split phase, single phase without giving any explanation.